The below normal activity in each basin is unusual. The reasons for the below normal activity are under review. In the Northwest Pacific, high-level above normal westerly wind shear across the tropics has limited hurricane development while stronger than normal low-level trade winds have suppressed activity in the deep tropics of the Northeast Pacific and North Atlantic.

A review of the seasonal hurricane activity predictors is mixed with warm SSTA in the main development region (MDR) supportive of hurricane development while fast trade winds suppressing tropical development have been a significant inhibiting factor.